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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                <h1>Shaped Fade Image & text Changer</h1>
<div class="main-wrapper">
  <div class="text-wrap">
    <div class="textbox">
      <h4>Tim Berners-Lee</h4>
      <p>In 1989, Tim Berners-Lee invented of the modern day world wide web, an Internet-based hypermedia initiative for global information sharing while at CERN, the European Particle Physics Laboratory. He wrote the first web client and server in 1990. His specifications of URIs, HTTP and HTML were refined as web technology spread.</p>
    </div>
    <div class="textbox">
      <h4>Modern Day Computing</h4>
      <p>Computers these days are light weight, portable with much more memory than the big bulky computers of the seventies, eighties and early nineties. Giving the modern day programmer much more computing power and a much cleaner look.</p>
    </div>
    <div class="textbox">
      <h4>Computing On The Go</h4>
      <p>As mentioned before the modern day computing is both light weight and portable meaning it is possible to work anywhere you like providing that you have connection to the internet or company server. While the invention of wi-fi has made home computing more flexible an mobile without trailing wires.</p>
    </div>
    <div class="textbox">
      <h4>Maximum Mobile Computing</h4>
      <p>The invention of the mobile phone has allowed computing to become even more mobile than the laptop and the Iphone has more memory than a lot of laptops. So with its large memory and being pocket sized the Iphone is the ideal tool to use when you are on the move.</p>
    </div>
  </div>
  <div class="overlay">
    <img src="https://drive.google.com/uc?id=17F09zegxBCHDgCo6CSxvGI_uV1jgGzTy" class="images" alt="Tim Berners-Lee inventor of the internet.">
    <img src="https://drive.google.com/uc?id=16tY6BLIgZzOAHwhqrNk8fuToE1hUy8BT" class="images" alt="computer desk.">
    <img src="https://drive.google.com/uc?id=11s_iHUq_GQWkYqX-kmwlLQHskZ1AWkdX" class="images" alt="outside computing.">
    <img src="https://drive.google.com/uc?id=18Q5xt2elEQM4UZzS_qk56BSffvMFXQDQ" class="images" alt="Woman on a mobile phone.">
  </div>
</div>
<div class="dotbox">
  <button class="dot" id="10" onclick="focusOnDot(this.id)">1</button>
  <button class="dot" id="11" onclick="focusOnDot(this.id)">2</button>
  <button class="dot" id="12" onclick="focusOnDot(this.id)">3</button>
  <button class="dot" id="13" onclick="focusOnDot(this.id)">4</button>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
}
body {
  background-color: #f7f7f7;
}
h1 {
  width: 770px;
  padding: 5px;
  margin: 30px auto 0px auto;
  color: #ffffff;
  font-size: 48px;
  border-radius: 10px;
  box-shadow: 1px 1px 5px #00ff00, 2px 2px 10px #ff7777;
  text-shadow: 1px 1px 5px #00ff00, 2px 2px 10px #ff7777;
  text-align: center;
}
.main-wrapper {
  position: relative;
  top: 80px;
  left: 50%;
  transform: translatex(-50%);
  width: 750px;
  height: 300px;
  background-color: #ffffdd;
  border: 2px solid #aaaaaa;
  border-radius: 20px;
  box-shadow: 2px 2px 15px 3px #77ff77, 4px 4px 20px 6px #ff7777;
  overflow: hidden;
}
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 450px;
  height: 600px;
  margin: -150px 0 0 0;
  background-color: #ffffff;
  border-right: 2px solid #aaaaaa;
  border-top-right-radius: 50%;
  border-bottom-right-radius: 50%;
  box-shadow: 1px 0 5px #999999;
  overflow: hidden;
}
.images {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  width: 450px;
  height: 300px;
  margin-top: 150px;
  transition-duration: 3s;
}
.images:first-child {
  opacity: 1;
}
.text-wrap {
  position: relative;
  float: right;
  margin: 10px 10px 0 0;
  width: 275px;
  height: 275px;
  padding: 10px;
  border: 2px solid #aaaaaa;
  border-radius: 10px;
  box-shadow: inset 2px 2px 10px #777777;
  overflow: hidden;
  z-index: 1;
}
.textbox {
  position: absolute;
  top: 10px;
  left: 10px;
  opacity: 0;
  width: 255px;
  height: 255px;
  background-color: #ffffdd;
  transition-duration: 3s;
}
.textbox:first-child {
  opacity: 1;
}
h4,
p {
  text-align: center;
}

.dotbox {
  position: relative;
  top: 110px;
  left: calc(50% - 126px);
  width: 257px;
  background-color: #ffffdd;
  border: 1px solid #aaaaaa;
  border-radius: 10px;
  box-shadow: 1px 1px 5px #00ff00, 2px 2px 10px #ff7777;
}
.dot {
  width: 20px;
  height: 20px;
  margin: 20px;
  background-color: #ffdddd;
  border: 1px solid #cc0000;
  outline: 2px solid #cc0000;
  outline-offset: +4px;
  border-radius: 50%;
}
.dot:nth-child(1) {
  background-color: #77ff77;
  border: 1px solid #77cc77;
  outline: 2px solid #77cc77;
}
.dot:focus {
  background-color: #77ff77;
  border: 1px solid #77cc77;
  outline: 2px solid #77cc77;
}
!

JS 

              
                var img = document.querySelectorAll(".images");
var box = document.querySelectorAll(".textbox");
var dot = document.querySelectorAll(".dot");
var i;

function focusOnDot(inc) {
  for (i = 0; i < img.length; i++) {
    img[i].style.opacity = 0;
    box[i].style.opacity = 0;
    dot[i].style.backgroundColor = "#ffcccc";
    dot[i].style.borderColor = "#cc0000";
    dot[i].style.outlineColor = "#cc0000";
  }
  inc = inc - 10;
  img[inc].style.opacity = 1;
  box[inc].style.opacity = 1;
  dot[inc].style.backgroundColor = "#77ff77";
  dot[inc].style.borderColor = "#77ff77";
  dot[inc].style.outlineColor = "#77ff77";
}
!
999px

Console